Hi Mala, that will happen if you drew a control point curve and used "Make corner point" for some of the points.
Those are spots that will create a sharp corner in the curve at that location if you move it around but will be smooth if all the neighboring control points are all on the same line.
If you generate a surface that inherits that type of control point structure with "corner points" in it, then the surface will basically have corner points in it as well where the surface will get a sharp crease in it if the corner points move out of line with neighboring points.
Usually that's not very desirable and you would want to not make corner points in the curves.
- Michael
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